Ubuntu：安装 Oracle JDK8

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https://www.fosstechnix.com/install-oracle-java-8-on-ubuntu-20-04/

  1. 下载 jdk-8u251-linux-x64.tar.gz

  2. 解压

    sudo mkdir  -p /opt/jdk
# 解压后放到/opt/jdk

  3. Install Oracle Java 8 on Ubuntu 20.04 LTS with Alternatives

    sudo update-alternatives --install /usr/bin/java java /opt/jdk/jdk1.8.0_251/bin/java 100

  4. 如果有多个版本可以这么切换

    sudo update-alternatives --config java

  5. 配置环境变量

    # 编辑 /etc/environment ，填入以下内容
JAVA_HOME=/opt/jdk/jdk1.8.0_251
JRE_HOME=/opt/jdk/jdk1.8.0_251/jre
# 使生效
source /etc/environment
标题：Ubuntu：安装 Oracle JDK8
作者：woyehua
地址：https://blog.stormbirds.cn/articles/2022/11/22/1669123799993.html

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